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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27240fd4860f4c121fd56213de38f3002e4791daf0d9888fe42f4b34a6c39552' 
  AND token = 'uXEH5HxywUw4F8yoxqd7qXjORR0gG/yRWMUVlOkS1bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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