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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb61b27ed11a806f920b092fa759063aff67a142cb3f925efcc5cd82244410a8' 
  AND token = 'UYu/fQaWWh4b4u9xI6wQ+8YtP602lN0bXnFCGUB/4nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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