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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02598aa4b77229a21f9040f17ecc837ae36ddc6ee74757af75ff3a720ca02267' 
  AND token = 'c8K3xRo6aqqgBnlPF8NjUPExHqS+Ev94R2H5wCTXPEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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