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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1137b026b77b2ce34887e056eb6951dde728a776c59fd854c2e67ff967e738f' 
  AND token = 'WGdT1VxmfwnDIjswPNXwWAMxUGC8d7R6PZvVUVC+EtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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