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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c90471eb5eb08cdc1f7bc9efd2dc0cf4c0d3302b561bdf55c6ebf9e8e22edf5' 
  AND token = '+OzyZd1XADEFewZAybjvRRVjhF/2+QjHFES0K0E87vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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