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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd67c00e805a1fb96c842912ee3648193841e39d3dcba84b382ec28bc9ba2e3d' 
  AND token = 'XedWLKVWnbJKslGSCHZKonKXEJnVdcw02doAsn0k+yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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