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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd601e8df0d5368bfe94f844d4b6510391ece48f991ba7ee298512ce376c156d0' 
  AND token = 'MHQKmz9gQRu1lvn7L7VM31O9G6Ah4LcQw15iwANbfos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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