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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe67195811f565112298629359c09a1d8241d99174fc7a732ecb91b5d9dd516' 
  AND token = '8YE2uoP4QJ6zP5bEcsOBuczpovgPoCKmGIVmRQYoqOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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