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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b7d4a40bfa54fca33cb55803d3ed732293162d2d94227b7bfc1f52cef4c4e7' 
  AND token = 'PE/rIQDbCeCTj9y5GcYW42r2RQr0qziFdIildg463n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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