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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36199e5cae3a22f81f419ce03fb41a207f0cfd2852b63249e9eeb21d6aa8749c' 
  AND token = 'iRkjK5tOYXhe4bwaSvr4s4rFCBHlTqCxZotRI8R6myY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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