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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ff0d19380d2384273028ed3afc295d82bad8a51c55e8a84807fcb6487a328f' 
  AND token = 'f8elY22lK+HEEepHvbOTa1MJA6md6wpHaTTejfSNgNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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