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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857f7a06d311dc38d770096b3e05fc902fd0fd00fbca116357154c2bd320db9a' 
  AND token = 'h3tLQjD8mPrbiSU/HYT0EVP194ejjjq1AFetL/ov5VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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