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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40df827667e784b51bab59e65ce426bd76418c1ee9dd536ce2bfedf5cb6a4c22' 
  AND token = 'MyUeTuTO0R40YN99xsCJsgIpejQp2e8Pp9xpG9OWkCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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