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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7691e015cc6b7a23a44a716503449f1602f151e11d6502fda293f1ce037683' 
  AND token = 'uZ/o5ZMFpOQIKWVnsjG9Oa41yEsCasBcax8S5Aptvx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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