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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9348f13e8b3a0b1a9d8eff1251e0b59807d2baa440ed5328bd7b717c40bc12f7' 
  AND token = 'KNTAGGN9pbsGn0biixi5PiTmitjbI9CXJOzyeMdzJ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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