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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71d87048bccdef4ebe43c76ee4f14aacb3cab233b0a3bfe8f82cddd9087b79d' 
  AND token = 'pnFG9xxx5jPoBGfzNOzq64u5R0ilQASSEvo2EabkZkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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