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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a47f1d149121a2661789805eea49e0acc0309c755ae46358f128336eadd3ddb' 
  AND token = '/W3CF3U9mfxzo8lTlU9FSjLt+SCuO2qB1t1RZ7vobTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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