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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68e674bb16854c8df85d20b5a3ac08a745d986cfe775511a23886c288caa8f7' 
  AND token = 'i7TA4u9ljwRiBTcHr90G5J3dPiFIooq39ApDb3ZE95c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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