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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8f5da31632dc54480e75495c4a51f69b8ba0d465c5e33b453bdd7ff2f69912' 
  AND token = '08+W04TyNv3eCeCMbePBjctqGOPif9XuXshSfT/fBX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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