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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0829e16ad4861003ffe8d4834d7c24f6e12a79afa9ddba0127cfe11b11331d65' 
  AND token = 'QlU2HjMOJw60kiFCGQWHI2vkfuzZKydmgnHi3olEUY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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