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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0155e22f208f7182281bab7e04640aa3eef64ff0b68c9ac0f7b0876e321859' 
  AND token = '6kwHvfvERjIQD63mwLtmYX2ngyArplrkYIc1/+EBo/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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