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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebecb05443620d289330b3cc1a7749c0c18408e7ca6cce73cd37e3edbcf3cbe3' 
  AND token = 'HwOdd1FMZgCXm9gGVoiSan8ZR9GsxdVZ8gR2R958ooA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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