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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02b16a02178e9877aec5bcb1ecc4163f21b1c2cb4cd446a7de2f3a2558c0be2' 
  AND token = 'ENEedgorDY7Ow2/6QhFnhTGNvBswy4u9/+PMBftoITc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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