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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c93d1e926f97b4fad7e6268d8b04f967b0a52decb92dcb20c71912f9959e94' 
  AND token = 'Ir0gZvctn3s9mwGF0U/vs6KPNqUmSecn3BamGQXHwyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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