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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae01cbeb0b74232486f822346642a0c509bbf24c27228e1e6344d0329a190ed0' 
  AND token = '3J7v+v/nGVeG+bOvb8/lsUg1N+YfjefQM+U99qwDE00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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