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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd132fd090e4e0556e98b140a2799a55dbef33679797c723e25237e9d93382d61' 
  AND token = 'xid8pWMKYJ/shqhAmVQ8c8ejKKfs9vbtm+BDemAmqeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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