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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663f69ff0af09d9ac35b1776381882f06124c9320564fd7f4d2fed97583400f3' 
  AND token = 'f8QBXllK0f8AysT4nbat0OxQhpBtrplAptvcF52XQ/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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