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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56de2b03fa9cd582263a1ac60a410efec8cbfe909b4dcc866a1f7758cd84f8c0' 
  AND token = 'AfhiV3AYZ3sK4+uMc+5+K2WdvV/Svscq8x8Han3wnrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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