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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aedd785908dadcd13a5565b48fc5b42e40819cc209f7a2571ee6dffce0c8b17c' 
  AND token = 'QIPBdolruNDPE5ksKyPnFa6SLYbFuh6cVTyMB4Yiz40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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