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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b7c3048ab2c00c7d364001f58af7c2eab663fcba6bfc2fb4f76ad38a79b87d' 
  AND token = 'Vdk2rygZqxKCVLBUZZ/0SMRg/yo389FFl7/nreYReY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}