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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eed7635e03dd21cf7acad4e375a61b640de6612c0072ea1acba3ebad8748a8a' 
  AND token = 'YGzc1cK3QCdz2ua+xSd8/u065FD2CuK4Hc4eHTN+YxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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