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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b17138de51cd3e6f433744ae8b09b8d0e0337642a1836b89c87b524d43b17c' 
  AND token = 'blJCYX9G/b6sy0n11zwzVW67VyoXw2+1OhfCmcPa/ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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