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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68a867eaa4a44d789e8f575b340402d1ff6866cb8cf2577ecbcd98ea64fe0ec' 
  AND token = 'H/tPnVNkluWmHxEz/c9S2GD3GXfbvcFA7c1ysiddYl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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