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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8897e0efaf4056e2d9c00ff090aa5a2c59af28a3cf0cc601a006c92831c3d5' 
  AND token = 'ZtiVC4X3/yuKsyD9CWpjz0gt1gsqIeI6ibMjbLPuy3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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