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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fddceef8d4fec59eb05f6a0ddaaa738a288ca26b8970d5172b0ff0c0218fabe1' 
  AND token = 'ov6xtItBxrwzOWYn6nZDep2KuDi+QxkdnyHhRw6mKZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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