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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2ca6c37e417141c9e21de87b3d03d95df26864b1411a053afabe7988106e8f' 
  AND token = 'bOVnAE8RaW7Jpp2B7SssLtfRyd71DpkH+6ZbJ+hPAwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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