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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53316714cc289b5691898df256208990e59608fc62b9de9d9c7cf45556d6238' 
  AND token = 'Wb3G+Mbo1FvVxe/s5qRru2mhN65XuE8Ww5vnluG7bsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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