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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61ece06552f6456076dfd2ea22dc449aa9d92b319ac43be120ec0ad9f9bd008' 
  AND token = 'nI33cY1YbGoN9nI6/ZnxDQf4N5aq3sJW9lPNhHd44/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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