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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029c340ee04a15110d2c3fc7d3d857f77129d017c2d6aa3388d2ef8c30930cd2' 
  AND token = '4ihtLjXyAyNoIeLI9LzQinXJi3ss4whp8iXbsp47s9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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