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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1989d773572abd677f7ccc0ff47d9795bdf18bb53903074ff4e5ab81bfa556' 
  AND token = 'wIpSwE5OpQvO5XnHT2Kx56TyqQhy+gx2CryyNq3Els0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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