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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9d69ac7983fb9300ec600b7dd29ed7ce66c29269c5ae58d4e9ddaa8927b151' 
  AND token = 'rQF8cOY1q6CLpyl5fgNnM91do1Wi/xCvFYpJJZIWC7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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