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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6c32d0ccbfede7670fe6452c92d02ef46a038d725c124f6d56026724a59b15' 
  AND token = '9YXwkkjkJWQMadYyG7YK8rqJCia11cabb/OCrF2xHEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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