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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6940ea8b18c84a7670ae5e49be472f422ceb45251cd80144a16773c5606ec984' 
  AND token = 'DmN0L0xv0hgeoYbhc+7x5ozqEsoToCPlmnBfGWo0wiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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