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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e03dd4a7a49d1e3fe483ef9656a7873ab3dba42145c84bc5a532def1d048c2af' 
  AND token = 'LCZhV7kciGk+8+T+Odj8yuoMNCIhjQRgxF7LIg0VCTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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