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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb46699cb1933e1bbb5b164eef7d3029c8aea9953b8e5d8faa4c012ce7cd14a' 
  AND token = '+acVq8RV31ivi4SasnNCrtSrZw6+Q9pFmkvwhXqmDmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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