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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c017695074a57ec0a78ecd90c25e573a31714f3c8ced02250eed7ff47ed32b33' 
  AND token = 'Kojw3li5/UDylV/s+WCSy+I4X6qITr5b9kYVNHCl7H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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