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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f90b7f3c6ca1cf960b0cd1238fbfe4d69ed7a2d52e25f1fe890949548b6f43' 
  AND token = 'Ybzpbb8N2l167aq/PzdMq/ahpIl94bXHCh4FZ1PVvyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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