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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2da3769f9e5a785e937ab950838fe54fe90f673810acb4de4c4dc24eb2871f7' 
  AND token = 'jc/ybDwwwRPdneEzVg9vibrWZR43g9PHwyhNnWjYpyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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