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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0fe0e7390575a2a962491e8c89552679216aa55a8c47cd2a9a61e89f9ae8cd' 
  AND token = '1uHqnKI2IInOUFJUAI+URej+yGkS+PJ7xEtDjGRlzTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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