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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab772af3e405adbd55620f7080ddb2460382b0c85297f328383ce1b058718c6' 
  AND token = '6wel7SE31qfP+JC+PH8gyuPGBlnbMXj1Em2/VO+duXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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