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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ba9f2c186eaff8377b02bcd5cbea36bce40d83fec7d9f325cd6ee95cc13498' 
  AND token = 'm8JNNNpIPwCxmyoeMQWo6MkDAJN53EVSVZbXJQ5YCwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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