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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174efde1ef09b1ce022f166dbbdb06947a0dfeda287531a1fa6adf5552c1d3eb' 
  AND token = 'S3V+S9l6YdnMb4h7yHr1I+SJM/hNuio1vm4hgeLfh8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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