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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd02b057c0e354b7aef29cd80a9ac360f68148c3d444edee571825574879e98d7' 
  AND token = 'pbqtmecwZsttegR5ekBLxn5H2Y14GLZsiNh7w7ZDEmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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