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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd37c5922a75ffe4df7dceefde6050738262d974ecc7e1cdabeccaa923fb605b' 
  AND token = 'qeXiABEg106IN/SN47BsIWz/EvJmwH6/jBCoi/IaWIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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