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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd65499aab3956b742de52858cf922b5ae713597e1f9e693103e6f06c811a98' 
  AND token = 'OgTqu0E/rL2ud4pYLwOny5b7l0IUCrkBm47af3qbUcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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