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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949584535a3d258d1b10c4add4dd1137822b7426f05240871e06e9df0a1bb0c9' 
  AND token = '1tY+BpN+OhViLT+r2FggBl5whE7u7FZHQIGay2N0Y1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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