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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba5a8e60ab25342ce0f45eecb496a70d973ee3b3af08d5ae2708cab6a71d402' 
  AND token = 'nyF1/Qfq7dc/V112CjoRBeI3st2W6VbGjXqevoK/C7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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