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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0fc6d931f74bce5fd5be300890ba93f5d0301eb4d0a531f012fa53b94480e7' 
  AND token = 'nhlbIh9u0yV2YTS7R59fxGhN7vvbHEBimVja+ffYNLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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