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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ae6ca94e2b3584223dffa51f6314dca1bc6b3edffd80db04fe987d3fc9b5f8' 
  AND token = 'IHRjA12YLJjUCy5eltIpJiTro1DlhWjOeI1liG6q/NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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