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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1480d58b26e4f057ccf70f69a2ced84f7ae156882a5235c3d7c6d54e84ad95ab' 
  AND token = '0O0ylCycG9A9rsT2WttwhfhZZusKODe5k+wztSJJSis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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