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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ebc7bde74cc613b63fc1d7511ee0de7df56f24ffb928050ba6bca90d91bec1' 
  AND token = 'D6lp8U4OVB5LOOsUici5Z+/LWlEdFyJd1RjhEc84RCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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