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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d8fe9c1963074217fc8f160f5e43a37b00fca03e11c0ea0aae0ebb9f59c1f7' 
  AND token = '2WA/Uu3HbR/K3WwXDuAhgsf8epksYtIGOSE983cXmEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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