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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfd15f006a10fbc8c4840fa22db6ed87539d41d8cdffcfbb3d1ccf471fed8cb' 
  AND token = 'xvRfcwMl4IhLQh0xCFUkWz/cLnf5pgzBsmQgTt423GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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