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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb83637ea1b02442a0b642879fda651d8929bd05697b8aab13b2fc944f56dbc9' 
  AND token = 'qtOi4/PdeZyKinLJtX+Ko+PMQyDRRmUd3ioI2bjkajI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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