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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4e9f2f1b0c75e1309e299b9d6cffae84b6944361cab4dae24dca34227c1998' 
  AND token = 'HVb61OujkYA4pEAcDJ6ImCV6H2RqpvAfyi7CMYieTtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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