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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ba9b39ff78fa7af5451d6b4326cec93b66fab3ac0912793a26f84c27a32af3' 
  AND token = '25CC1CiO4ZboVyTU+RfmeSqecu9+RU+VuAGr5jPS00I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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