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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9093c7fe5d2e8e0ab555d3b00d34e5e82845a0a600a27292af8be1321f684b4c' 
  AND token = 'nfVqxkoWu/g5yN2904o2+ubjylwtuXPP0zG9WGifrpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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