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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3960bd64998c191fe088feffd7b67be8b94c6216c941b60f9a0153e24d41a8' 
  AND token = 'FMJMWrAVpnu0ctzTtVRhKyvX/i/nOcEtsaCpvahJ6dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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