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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676a69afd85ea32e16fe3e8784bc5924af50dd3fcbbd134f78ed69ebcacab0f5' 
  AND token = 'p28M2aRG/deU85jgofrRUItY85WirV85iljBEH6SsbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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