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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debd96a3172b029de7674cacbc701a43ea1a5a53d6e7fed82bb38f69723b12e4' 
  AND token = 'fglTcuGFCFI3XmjjK1Eng1GIY3Xb0d3hjKl9/pc2fwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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