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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaaca2a542d1baeddfbd78964e9656c739205f89ef09ed6dd1e35ad71fdeb31f' 
  AND token = 'OdbECzu27SqLFLlU1iYpIJ6dWPhKyXewASPtun8fDEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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