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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8d4372a91ea5b4d2eb4273a90cf69c6ecb95153a7b076d20ad576c4bddb6c3' 
  AND token = 'VeNDwB6RPXw6NEFMxwY7whzMth97mnW/TBgrRmL960A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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