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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '527d1f93264078de93e913faf4b72ec7f9082052f173f41f1a36cb7c5743f20d' 
  AND token = 'LHcptEftEcnSXtkinY8FbMNIjyA9HWhM9P3WX3JOevo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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